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Equity Method Investments - Equity Method Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 10, 2014
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                  
ADES equity earnings   $ (41)     $ 5,603     $ 5,133 $ 22,019
Capital calls and variable payments               1,083 5,132
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                  
Distributions from equity method investees, return on investment               2,519 1,259
Earnings (loss) from equity method investments   (41)     5,603     5,133 22,019
Included in investing cash flows               4,730 22,547
Clean Coal Solutions (CCS)                  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                  
Gross profit (loss)   25,035     23,075     80,869 60,580
Operating expenses   5,369     4,856     17,872 14,275
Income (loss) from operations   19,666     18,219     62,997 46,305
Other expenses   (1,464)     (483)     (1,794) (1,224)
Class B preferred return   (1,463)     (2,176)     (4,825) (6,759)
Loss attributable to noncontrolling interest   3,698     4,163     6,811 7,164
Net income (loss) available to Class A members   20,437     19,723     63,189 45,486
ADES equity earnings   0 $ 4,630 $ 100 6,226 $ 9,733 $ 6,588 4,730 22,547
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                  
Earnings (loss) from equity method investments   0 4,630 100 6,226 9,733 6,588 4,730 22,547
Included in investing cash flows   0 $ 4,630 $ 100 6,226 $ 9,733 $ 6,588    
Clean Coal Solutions Services (CCSS)                  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                  
Gross profit (loss)   (11,616)     (5,247)     (31,511) (14,064)
Operating expenses   41,322     25,082     120,269 68,463
Income (loss) from operations   (52,938)     (30,329)     (151,780) (82,527)
Other expenses   (7)     (34)     (86) (57)
Loss attributable to noncontrolling interest   55,661     32,147     158,926 87,642
Net income (loss) available to Class A members   2,716     1,784     7,060 5,058
ADES equity earnings   1,358     892     3,530 2,529
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                  
Distributions from equity method investees, return on investment               2,519 1,259
Earnings (loss) from equity method investments   1,358     892     3,530 2,529
RMC6, LLC (RCM6)                  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                  
Gross profit (loss)   (2,896)     (3,326)     (4,876) (5,298)
Operating expenses   590     581     1,567 1,447
Income (loss) from operations   (3,486)     (3,907)     (6,443) (6,745)
Other expenses   (220)     (265)     (382) (434)
Net income (loss) available to Class A members   (3,706)     (4,172)     (6,825) (7,179)
ADES equity earnings   (1,399)     (1,515)     (3,127) (3,057)
Capital calls and variable payments $ 2,400 850     1,353     1,080 2,736
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                  
Earnings (loss) from equity method investments   $ (1,399)     $ (1,515)     $ (3,127) $ (3,057)